Boring-bar.



A.' P. LIDBN. BORING BAB. APPLIOATIO'H FILED IEB. 13, 1900.

Patented Dec. 14,1909.

W/T/YESSES.'

Ammew4 l GRAHAM co. Pnomumomuruiks. wthnqm, n C,

UN 1F11@ AUGUST FERDINAND LIDEN, 0E' CHICAGO, ILLINOIS.

B ORING-BAR.

Specification of Letters Patent.

Fatented Dee. 1d, 1909.

Application filed February 13, 1909. Serial No. 477,713.

To all "whom it may concern:

Be it known that 1, AUGUST FERDINAND Liman, a subject of the King ofSweden, re-

siding at Chicago, in the county of Cook and State of Illinois, haveinvented a, new and useful Boring-Bar, of Which the following is aspecification, reference lbeing had to the i accompanying drawings,illustrating same.

My invention relates to boring bars used on lathes or other suitablemachines.

The principal objects of my invention are to provide improved means forclamping the cutting bit in place in a boring bar, in a plurality ofpositions; to provide improved means for clamping the bar in itscarriage, and for securing the bar against turning in its carriage; andto provide improved means for adjusting the position of the barrelatively to the carriage.

Other objects u'ill be apparent from the following specification.

1n the accompanying drawings illustrating the preferred form of myinvention, Figure 1 is a side elevation of the improved boring bar andits carriage, With portions shown in cross-section; F ig. 2 is a planview of the device shown in Fig. 1, with portions shown incross-section; Fig. 3 is an end elevation of the device shown in Figs. 1and 2;

and Fig. et is a side elevation of the eccentric bushing used in theboring-bar carriage.

Like characters refer to like parts in the several figures.

1n the drawings the carriage is shown as having a hub 1 and suitablelegs 2 2 carrying the hub and constructed to be suitably movable alongthe bed of a lathe or other suitable machine. The method of supportingthe carriage relatively to the bed of a lathe is believed to be Wellunderstood. YWithin the hub 1 is carried a bushing 3 which is preferablysplit from opposite ends as shown at 4 L1 in Fig. 1, to allow thebushing 3 to be tightly clamped around the bar which is extendedeccentrically through the bushing 3. The hub 1 is split as at G so as topermit of being tightly clamped around the bushing 3, the hub 1 beingprovided With bolts 7 7 for tightly clamping it around the bushing 3 ina manner Well understood. The hub 1 is also provided With a set-screu7 8adapted to fit in a transverse channel 9 in the bushing 3 to lock thelatter against turning in the hub 1. The channel 9 is formedeccentrically, relatively to the hub 1, as shown in Fig. 3, so that anyturning of the bushing 3 Within the hub 1, in the direction of arrow 11,produced by undue pressure on the cut-- ting bit 10 of the boring barwhen the latter is in service, will tend to tighten the inner l surfaceof the channel portion 9 against the l set-screw 8. The bar 5 is placedeccentrically through the bushing 3, as shown in Fig. 3, so that byturning the bushing 3 Within the hub 1 the height of the bar 5 above thelathe bed can be suitably regulated as desired. 1t Will also be seenthat this arrangement permits of a side adjustment of the bar as Well asa vertical adjustment thereof.

he bushing 3 is preferably flattened at one end as at 12 12, so that itcan be easily grasped by a wrench if desired.

rthe cutting bit 10 is inserted through one end of the hollowv bar 5 asshown in Figs. 1 and 2, and is suitably held in place by a rod 13 Withinthe hollouT bar 5, which rod 13 is provided with a nose 111, preferablytoward one side thereof as shown, adapted to be tightly clamped against.the bit 10 by a clamping screw 15 at the opposite end of the bar shownin Figs. 1 and 2. The clamping screw 15 is screwed through the and ispreferably separate from the rod 13, the latter being removable from thehollow bar When the bit 10 is removed.

l 1t will readily be seen that the bit 10 may be easily loosened bysimply unscrewing the clamping screw 15. The rod 13 is preferablyflattened as at 17 to cooperate With the inner end of a set-screw 13carried by the bar 5, preferably as shown in Fig. 1, for the purpose ofpreventing the rod 13 from turning within the bar e especially when itis being adjusted by the clamping screw 15. lVhen such adjustment isbeing made the set-screw 1S is not clamped tightly againstthe surface 17of the rod 13.

The cutting bit 10 may be inserted squarely through the bar as shown inthe position 19 of Fig. 2, or it may be inserted obliquely through thebar. 5, as shown at 9.0 in Fig. the bar being' suitably provided Withholes through the Wall thereof as shown in Fig. 2. to permit suchpositioning of the bit 10. Whether the bit 10 is placed squarely throughthe bar or obliquely therethrough, j the nose 14 of the rod 13 servesthe same purpose of securely clamping the bit 10 in place; in theposition 2O the nose 141 taking the position 21 as shown in Fig. 2. Thisi construction provides a very simple and etliend 16 oi the bar 5preferably as shown..

cient means for readily clamping the cutting bit in place relatively tothe bar 5, in a plurality of positions. The improvements of such aconstruction are very apparent.

I desire it to be understood that l may use split secondary bushings 222Q in the primary bushing 3, if desired, so that various sizes of bars 5may be used with a single primaryT bushing 3.

I do not Wish to limit this invention to all of the exact details ofconstruction herein shown, as various modications of same may be madeWithout departing from the scope of the appended claims.

W' hat l claim as in y invention is:

l. A device of the character described comprising a carriage having ahub thereon, a bushing carried Within the said hub, a boring barextending through the said bushing, the latter having a transverseeccentric channel therein, and a set-screw carried by the said hub andcooperating with the said channel whereby any turning` of the saidbushing within the hub during the operation of the device tends totighten the said setscrew against the said channel portion for purposessubstantially as described.

2. A device of the character described comprising a carriage having ahub thereon, a bushing carried Within the said hub, a boring barextending through the said bushing eccentrically whereby the position ofthe said bar relatively to the carriage may bev adjusted as desired, thesaid bushing having a transverse eccentric channel therein, and aset-screw carried by the said hub and cooperating With the said channelwhereby any turning of the said bushing Within the hub during theoperation of the device tends to tighten the said set-screw against thesaid channel portion for purposes substantially as described.

3. An adjustable support comprising a hub, a bushing carried Within thehub, a transverse eccentric channel in the bushing,

and a member carried by the hub and cooperating With the said channelwhereby any turning of the said bushing Within the hub tends to tightenthe said member against the said channel portion for purposessubstantially as described.

4. A boring bar comprising a tube having a plurality of holes throughthe Wall thereof near one end thereof to accommodate a bit in aplurality of angular positions relatively to the tube, a bit adapted tobe inserted through the said holes in each of the said positions, one ofthe said holes being common to each of the said positions, a rod carriedWithin the said tube and having a nose adapted to bear against the saidbit to clamp the latter in place in each of the said positions, andmeans for tightening the nose of the said rod against the said bit ineach of its said positions for securely clamping the bit in place.

5. A boring bar comprising a tube having` a plurality of holes throughthe Wall thereof near one end thereof to accommodate a bit in either asquare or an oblique position relatively to the tube, a bit adapted tobe inserted through the said holesI in each of t-he said positions, oneof the said holes being common to both of the said positions, a rodcarried Within the said tube and having a nose adapted to bear againstthe said bit to clamp the latter in place in each of the said positions,and means for tightening the nose of the said rod against the said bitin each of its said positions for securely clamping the bit in place.

As inventor of the foregoing I hereunto subscribe my name this 10th dayof February, 1909.

GUST FERDINAND LIDEN.

lllitnesses CONSTAN CARLSON, O. J. NOTHENBERG.

